﻿using System.Drawing;
using System.Runtime.InteropServices;

namespace Vanara.Interop
{
	internal static partial class NativeMethods
	{
		public enum LogFontCharSet : byte
		{
			ANSI_CHARSET = 0,
			DEFAULT_CHARSET = 1,
			SYMBOL_CHARSET = 2,
			SHIFTJIS_CHARSET = 128,
			HANGEUL_CHARSET = 129,
			HANGUL_CHARSET = 129,
			GB2312_CHARSET = 134,
			CHINESEBIG5_CHARSET = 136,
			OEM_CHARSET = 255,
			JOHAB_CHARSET = 130,
			HEBREW_CHARSET = 177,
			ARABIC_CHARSET = 178,
			GREEK_CHARSET = 161,
			TURKISH_CHARSET = 162,
			VIETNAMESE_CHARSET = 163,
			THAI_CHARSET = 222,
			EASTEUROPE_CHARSET = 238,
			RUSSIAN_CHARSET = 204,
			MAC_CHARSET = 77,
			BALTIC_CHARSET = 186
		}

		public enum LogFontClippingPrecision : byte
		{
			CLIP_DEFAULT_PRECIS = 0,
			CLIP_CHARACTER_PRECIS = 1,
			CLIP_STROKE_PRECIS = 2,
			CLIP_MASK = 0xf,
			CLIP_LH_ANGLES = 1 << 4,
			CLIP_TT_ALWAYS = 2 << 4,
			CLIP_DFA_DISABLE = 4 << 4,
			CLIP_EMBEDDED = 8 << 4
		}

		public enum LogFontFontFamily : byte
		{
			FF_DONTCARE = 0 << 4,
			FF_ROMAN = 1 << 4,
			FF_SWISS = 2 << 4,
			FF_MODERN = 3 << 4,
			FF_SCRIPT = 4 << 4,
			FF_DECORATIVE = 5 << 4,
		}

		public enum LogFontOutputPrecision : byte
		{
			OUT_DEFAULT_PRECIS = 0,
			OUT_STRING_PRECIS = 1,
			OUT_CHARACTER_PRECIS = 2,
			OUT_STROKE_PRECIS = 3,
			OUT_TT_PRECIS = 4,
			OUT_DEVICE_PRECIS = 5,
			OUT_RASTER_PRECIS = 6,
			OUT_TT_ONLY_PRECIS = 7,
			OUT_OUTLINE_PRECIS = 8,
			OUT_SCREEN_OUTLINE_PRECIS = 9,
			OUT_PS_ONLY_PRECIS = 10
		}
		public enum LogFontOutputQuality : byte
		{
			DEFAULT_QUALITY = 0,
			DRAFT_QUALITY = 1,
			PROOF_QUALITY = 2,
			NONANTIALIASED_QUALITY = 3,
			ANTIALIASED_QUALITY = 4,
			CLEARTYPE_QUALITY = 5,
			CLEARTYPE_NATURAL_QUALITY = 6
		}

		public enum LogFontPitch : byte
		{
			DEFAULT_PITCH = 0,
			FIXED_PITCH = 1,
			VARIABLE_PITCH = 2
		}
		/// <summary>The LOGFONT structure defines the attributes of a font.</summary>
		[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
		public struct LOGFONT
		{
			/// <summary>
			/// The height, in logical units, of the font's character cell or character. The character height value (also known as the em height) is the
			/// character cell height value minus the internal-leading value. The font mapper interprets the value specified in lfHeight in the following manner.
			/// <list type="table">
			/// <listheader>
			/// <term>Value</term>
			/// <definition>Meaning</definition>
			/// </listheader>
			/// <item>
			/// <term>&gt; 0</term>
			/// <definition>The font mapper transforms this value into device units and matches it against the cell height of the available fonts.</definition>
			/// </item>
			/// <item>
			/// <term>0</term>
			/// <definition></definition> The font mapper uses a default height value when it searches for a match.
			/// </item>
			/// <item>
			/// <term>&lt; 0</term>
			/// <definition>The font mapper transforms this value into device units and matches its absolute value against the character height of the available fonts.</definition>
			/// </item>
			/// </list>
			/// <para>For all height comparisons, the font mapper looks for the largest font that does not exceed the requested size.</para>
			/// <para>This mapping occurs when the font is used for the first time.</para>
			/// <para>For the MM_TEXT mapping mode, you can use the following formula to specify a height for a font with a specified point size:</para>
			/// </summary>
			public int lfHeight;

			/// <summary>
			/// The average width, in logical units, of characters in the font. If lfWidth is zero, the aspect ratio of the device is matched against the
			/// digitization aspect ratio of the available fonts to find the closest match, determined by the absolute value of the difference.
			/// </summary>
			public int lfWidth;

			/// <summary>
			/// The angle, in tenths of degrees, between the escapement vector and the x-axis of the device. The escapement vector is parallel to the base line
			/// of a row of text.
			/// <para>
			/// When the graphics mode is set to GM_ADVANCED, you can specify the escapement angle of the string independently of the orientation angle of the
			/// string's characters.
			/// </para>
			/// <para>
			/// When the graphics mode is set to GM_COMPATIBLE, lfEscapement specifies both the escapement and orientation. You should set lfEscapement and
			/// lfOrientation to the same value.
			/// </para>
			/// </summary>
			public int lfEscapement;

			/// <summary>The angle, in tenths of degrees, between each character's base line and the x-axis of the device.</summary>
			public int lfOrientation;

			/// <summary>
			/// The weight of the font in the range 0 through 1000. For example, 400 is normal and 700 is bold. If this value is zero, a default weight is used.
			/// </summary>
			public int lfWeight;

			/// <summary>An italic font if set to TRUE.</summary>
			public byte lfItalic;

			/// <summary>An underlined font if set to TRUE.</summary>
			public byte lfUnderline;

			/// <summary>A strikeout font if set to TRUE.</summary>
			public byte lfStrikeOut;

			/// <summary>The character set.</summary>
			public LogFontCharSet lfCharSet;

			/// <summary>
			/// The output precision. The output precision defines how closely the output must match the requested font's height, width, character orientation,
			/// escapement, pitch, and font type.
			/// </summary>
			public LogFontOutputPrecision lfOutPrecision;

			/// <summary>The clipping precision. The clipping precision defines how to clip characters that are partially outside the clipping region.</summary>
			public LogFontClippingPrecision lfClipPrecision;

			/// <summary>
			/// The output quality. The output quality defines how carefully the graphics device interface (GDI) must attempt to match the logical-font
			/// attributes to those of an actual physical font.
			/// </summary>
			public LogFontOutputQuality lfQuality;

			/// <summary>The pitch and family of the font.</summary>
			public byte lfPitchAndFamily;

			/// <summary>
			/// A null-terminated string that specifies the typeface name of the font. The length of this string must not exceed 32 TCHAR values, including the
			/// terminating NULL. The EnumFontFamiliesEx function can be used to enumerate the typeface names of all currently available fonts. If lfFaceName is
			/// an empty string, GDI uses the first font that matches the other specified attributes.
			/// </summary>
			[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
			public string lfFaceName;

			public bool Italic
			{
				get { return lfItalic == 1; }
				set { lfItalic = System.Convert.ToByte(value); }
			}

			public bool Underline
			{
				get { return lfUnderline == 1; }
				set { lfUnderline = System.Convert.ToByte(value); }
			}

			public bool StrikeOut
			{
				get { return lfStrikeOut == 1; }
				set { lfStrikeOut = System.Convert.ToByte(value); }
			}

			public LogFontPitch Pitch
			{
				get { return (LogFontPitch)(lfPitchAndFamily & 0x0F); }
				set { lfPitchAndFamily = (byte)((lfPitchAndFamily & 0xF0) | (byte)value); }
			}

			public LogFontFontFamily FontFamily
			{
				get { return (LogFontFontFamily)(lfPitchAndFamily & 0xF0); }
				set { lfPitchAndFamily = (byte)((lfPitchAndFamily & 0x0F) | (byte)value); }
			}

			public static LOGFONT FromFont(Font font)
			{
				if (font == null)
					throw new System.ArgumentNullException(nameof(font));
				var lf = default(LOGFONT);
				font.ToLogFont(lf);
				return lf;
			}

			public Font ToFont()
			{
				try
				{
					return Font.FromLogFont(this);
				}
				catch
				{
					return new Font(lfFaceName, lfHeight, FontStyle.Regular, GraphicsUnit.Display);
				}
			}

			public override string ToString() => $"lfHeight={lfHeight}, lfWidth={lfWidth}, lfEscapement={lfEscapement}, lfOrientation={lfOrientation}, lfWeight={lfWeight}, lfItalic={lfItalic}, lfUnderline={lfUnderline}, lfStrikeOut={lfStrikeOut}, lfCharSet={lfCharSet}, lfOutPrecision={lfOutPrecision}, lfClipPrecision={lfClipPrecision}, lfQuality={lfQuality}, lfPitchAndFamily={lfPitchAndFamily}, lfFaceName={lfFaceName}";
		}
	}
}
